It's actually the other way around, Bing does websearches based on what you've asked it and then the answer it generates can incorporate information that was returned by the websearching. This is why you can ask it about current events that weren't in its training data, for example - it looks the information up, puts it into its context, and then generates the response that you see. Sort of like if I asked you to write a paragraph about something that you didn't know about, you'd go look the information up first.

but humans also can differentiate between copyrighted and public works

Not really. Here's a short paragraph about sailboats. Is it copyrighted?

Sailboats, those graceful dancers of the open seas, epitomize the harmonious marriage of nature and human ingenuity. Their billowing sails, like ethereal wings, catch the breath of the wind, propelling them across the endless expanse of the ocean. Each vessel bears the scars of countless journeys, a testament to the resilience of both sailor and ship.